/Engine/Source/Runtime/ImageCore/Public/ImageParallelFor.h
ProcessLinearPixels act on image pixels as TArrayView64Colors pass a lambda that is : ProcessLinearPixelsAction ProcessPixels(TArrayView64Colors) returnProcessLinearPixelsAction::Modifiedif you modify colors returnProcessLinearPixelsAction::ReadOnlyif you only read and don't change colors your lambda will be called on one row at a time
namespace FImageCore { template<typename Lambda> void FImageCore::ProcessLinearPixels ( const [FImageView](API\Runtime\ImageCore\FImageView) & Image, const Lambda & Func ) }